Cut-gage for machine-tools.



B. NEFEDOV.

CUT GAGE FOR MACHINE TOOLS.

APPLICATION FILED MAYIS. 19:1.

Lwmm.

m 0 W W 1 WW m VD: W 8 m m M A Q B &

WITNESSES rue mmms runs to. Puma-Luna" wAsnnmmN. D. c.

Basin nnrinnov, (in-BROOKLYN, new YORK eashes;

Specification 6r Letters Patent.

cur-s ren FOR MACHINE-room;

Patented Nov. .5, item;

- isa full, clear, and exact description;

Among the principal objects which the present invention has in view are: 1T0 fur nish means for accurately disposingithe lathe cuttingytool to the Work to be performed thereby; to indicate optically the extent of movement of said tool;.to rapidly adjust said'tool'to the workrequired ;vto avoidover cutting. by said tool; and to simplify the construction ofthe gage for setting the-f tool.

Figure 1. is a side View" of a gage con structed and; arranged in accordance with the present invention,. showing in conjunc+ tion therewith a fragment of alathe center pin, a i tool 1 table and cutter therein, and an endiview of work beingrturnedi. all ofthe parts being: shown in theircooperative? rela+ tion; a Y a i Fig. 2=is aivertical sectionwofv annicroinetric inechanisnrwith WlllClPtlfG gage is-provided the section being taken as on the line 2-:-2 in Fig. .3; i Y 1 i 133' g. 8.is a vertical sectionofithesame; the section being takenas*on-thelineb3-3 of Fig; 2; i

Fig. 4: is: a sideviewe of'a modified form of the micrometric mechanismemployed in the present-1 gage; r Fig. 5 is an eXtremeedgeI vieW ofthesame.

Description.

Assecn in the drawings, the gage herein disclosed has a relatively stationary. member, a relatively movable member, and means for determining accurately the relativedisposi tion of the two members; The stationary member comprises a: handle bar. which is composed primarily of: framing ribs lOl and 11, and side plates -tl2lrands13 thereforrra'lhc ribslO and l1and side plates12 and l3=form a pocket whereinwmoves thei-reach bar 14 0f the movable memben above mentioned. i

Rigidly "connected with or integrally a. formed from ethe framingrrib 110,19 awsur-face 1O andthe-handle member of whichsaid rib I forms a part. Bothdongitudinal edges of the armlfuare finished. The outer edge of said arm isused for engaging the center pin A of a lathe by which the work B'issupported; The diameter of the pin A is 0011-. stan't and ascertained;

To support the tool so thatithe ends of the arms; 15 and 1- 24' and theicenter of the pin A are in line, thereis provided an adjustable rest embodying." a plate-16 and a slotted standard 17. Through the slot l8 -of the standard .17 passes aset screw 19, the threads whereof; engage the threadsin a tappedhole formed in the plate 12and rib 10. 'lhe serew 19- when! set. up. clamps the standard 17 to hold.- theplatelfi fixed relatively to the plate 12.

When the-reach bar 14 is fully retracted, the inneredge of thegagearm 20 rests firmly against theinnen edge of the gage arm 15. I11 thispositionythe edges 2L of the side plates forming the arm120 rest in contact with the BdgGSQQOftlIGSldG plates 12 forming the handle:oft-hegage. Also inthis-position the zero line of the scale 23 coincides with r the inner edgesiof. the arms 15 and 20 When abutted, but it willbeobservedthat thB-SlIOFtiaImZLiS spaced apart from the inner edge of? the: 5111111115, and" that the pointer 25- is disposed: at the point marked 50 on the scale. QG-With which the dial 27 is furdrawings, the

tOOlllK-ld: quadrant 31; which ismomited at the end' of "a long arm 32 a The spring 34eoperates to rotate the shaft 29 and: pinion 33 to carry the pointer fiii tc- Ward the" position on the dial marked 0.

If unrestrained -by"thegreater strengtl'r of 3 the spring 30, the spring 34 performs this 7 function, moving the arm 32, andiquadrant 31 in conso'nance therewith.

The arm 32 is engaged by the lever 35 and screw 36. The lever 35 is pivoted on a shaft 37 between the side platesof the gagearm 20. The short end 24 of the saidlever ex tends below the arm 20. The end of the short arm 24 is cut away to form a notch 33 into which'the cuttinged'ge of a tool C is placed when set. The short, abutment forming the upper wall of the notch 38 is disposed at about the level of the center ofthe pin A and the work'C. This arrangement provides for settingthe cuttingtool at the most desired point of operation thereof.

' I The screw36, as shown 'bestin Fig. 3 ofthe drawings, is mountedin a tapped recess in the side of the bifurcated members of the lever 35. The end of the screw 36-bears I against the forward edge of the arm 32. The

spring 30 under all conditions tends to hold the arm 32 in its fully retractedposition:

- It is ,obvious that as the screw36 isadvanced,

of the bar 14. The spaces or divisions are preferably divided into tenths, and the numerals 5 on the scale-indicate five-tenths of the various spaces. From this it is obvious that the zero point'on the scale-23 is coincident with the inner edge of the arm20. 1

:The reach bar is normally held "in ad- -.justed position by the toothed-segment 42 at the end thereof, which engages the teeth formed on the inner edge of the framing rib 10. Thebar' 14 is held in engagement with theteethof the rib 10 bythe pressure of the head'43 of a rocking lever 44. The-lever 44 is pivoted on the pivot screw 45 and is normally rocked to depress the head 43 by 'a spring 46. The tail end of the'lever 44 extends above the side plates .12- of the handle of the tool sufficient to permit the operator depressing the same. By depressing the lever 44, the'chead 43 is lifted suffivciently to perinitthe',reachbar to be raised out of engagement with. the rack teeth of the rib'lO. When thus disposed,the reach bar may be drawncout to any desired distance and'set'with reference to the scale-23.

In the modified form of ,the invention shown in Figs. 4' and '5, ,ofthe drawings, a circular dial 39 is substituted for the semicircular di'al 27. The dial 39 is covered by a transparent crystal 40 .to protect the pointer 41', The operation of the pointer 41 avoided.

The operation of the herein-disclosed gage is as follows: The operator knowing the diameter of the center pin A deducts this I from the ascertained diameter of the finished product. The sizes of the divisions on'the scale 23 of the reach bar 14 are actually one-half of those indicated by the markings. Thus the necessity of dividing the diameters to obtain the radii of the center 'pin and the finished product is The difference between the diameters above noted having been ascertained, the reach bar 14 is so adjusted that the mark on the scale 23 corresponding to said differcnce registers with the edges 22 of the plates 20. To move the-bar 14, the lever 44 is depressed to release the said bar from engagement with the teeth of the frame piece 10. The bar having been adjusted, the lever 44 is released to permit the spring 46 to depress the said reach bar for engagement thereof by the teeth in said frame piece.

It will be remembered that the short arm 24 of the lever 35 is normally held back from the plane of the edge of the arm 20. hen this short arm 24 is moved to coincide with the edge of the arm 20, the lever 35 will be rocked to permit the arm 32 to be moved by the pinion 33 and spring 34 until the pointer 25 or 41, as the case may be, rests opposite the zero indication on the dial 27 or 39. The movements of the pointers 25 and 41' aremagnified to such an extent that every slight movement of the short arm 24-produces a relatively large movement of said pointers. As a result of this construction, the mechanic is enabled to determine the position of the pointer of the cutter C withreference to the measurement of the finished product upon which he is working. [is an example, if the gage is set andthe scale 26 represents divisions of the inch, the operation would be as follows: The gage would be disposed on the center pin A adjacent the tool stock of a lathe. The plate 16 having been adjusted so that the notch 38 is properly disposed, the back ofthe arm 15 is drawn against the side of the. pin A. The cutting tool C is then ad vanced until the cutting edge rests within the notch 38 of the short arm 24. At this point a relatively coarse cut could be made, and the mechanic could advance the tool C until the pointer 25 registers with the calibration on the scale 26 indicated by the numeral 20. Succeeding cuts would be measured by advancing the cutter C, the advance being disclosed by the movement of thepointer 25. It is obvious that as the set of the tool C approaches the final cut, which would be when the pointer reaches the cali bration mark 0, the movement of the said cutter could be very minute and the chances of overcutting the product be minimized, if not totally eliminated.

Olaims.

1. An apparatus as characterized comprising cooperative gage members; a reach bar fixedly attached to one of said members and slidably connected With the other Inember, said reach bar having calibrated scales for indicating the adjustment of said gage members; a responsively' yielding member pivoted on one of said gage members and normally held in advance of the position assumed by it in correspondence With the position indicated 011 said reach bar; and means operatively connected With said yielding member for micrometrically indicating the movement of said yielding member.

2. An apparatus as characterized comprising a plurality of separable gage mem bers adapted for disposition between a cuttlng tool and a Work-holding member; a

calibrated gage operatively connected with said separable members for indicating the desired Working position of said out ting tool; movement-magnifying indicating means structurally incorporated With one of said gage members for interposition between said gage member and said cutting tool; and means for yieldingly holding said indicating means in the path of said cutting tool.

An apparatus as characterized comprising a stationary gage member; a gage member movable relatively to said stationary gage member; extension bars, one mounted on each of said members for engaging the center pin of a machine tool and a cutting tool thereof, respectively; means for locking said members in adjusted relation; and a movement-multiplying indicator mounted on one of said gage members for registering its relation to the other of said gage members, said indicator being adapted to be engaged by said cutting tool for movement of said indicator While being advanced to the Working position of said tool.

BASIL NEFEDOV.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

